hw11 - Spring-2011 CMSC 250 Homework 11 Due Wed NOTE Due AT...

Spring-2011CMSC 250: Homework 11Due: Wed Apr 27, 2011NOTE: Due AT THE BEGINNING of Recitation!COURSE WEBSITE: http://www.cs.umd.edu/∼gasarch/250/S11.htmlNOTE: In this HWN={0,1,2, . . .}. In this HW answer can use choose-notation or factorialsor powers. That is, the answer can be (say) 100choose5 rather than acutally give us the number.1. (0 points) What is your name?Write it clearly.Staple your HW.What is your SEC-TION NUMBER. KRUSKALS STUDENTS: Your FINAL is in the BSR building (BiosciencesResearch).WALK TO IT so that you KNOW WHERE IT IS. What TIME is the exam.(GASARCHS STUDENTS- You will have the final at the same time but might be in a dif-ferent place.) READ the book review pointed to by COMB on the main page next to wherethis HW was posted.2. (30 points) There are 2nstudents taking MATH 410. Of these,nare female andnare male.(a) How many ways are there to form a committee ofnstudents from the class?(b) Let 1≤i≤n. How many ways are there to form a committee ofnstudents of whichiare male andn-iare female?

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